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  1. MP1

    power supply connector

    I think you are referring to "banana jacks". These are most common and available at almost all electronics sources. I have no idea where this name came from. At least, that is what they are called in North America. Perhaps there are other names as well? MP
  2. MP1

    MAX232 data sheet

    This sheet covers many of them (attached), The MAX233 does not require the external capacitors. MAX232 is the standard. MP MAX220-MAX249.pdf
  3. MP1

    mercury switch

    If this is refering to the following project: http://www.electronics-lab.com/projects/misc/007/index.html Then I do not think that you are going to be very successful with using a different type of switch in the same place. ;D The mercury switch is meant to be in your pocket and the movement...
  4. MP1

    IS42s16400a (SDRAM) - 39VF160 (Flash memory)

    Here is half of it: http://www.mcu-memory.com/datasheet/issi/sdram/42S16400A.pdf This is for the SDRAM chip. I did not have any luck for the other number. Perhaps someone else can help. MP
  5. MP1

    3-Axis Stepper Controller

    In the case that you need higher voltages for a stepper motor, you normally trigger the base of a NPN power transistor and run the higher voltage throught the transistor. The rest of the circuit is just used for triggering and remains the same. MP
  6. MP1

    Free sample chips!

    Billy, Mixos might be a better source for the Microchip devices (PIC). I have not used them for quite some time now. I primarily use the Atmel AVR series and ATMEGA series. In my case, I have a local distributor, which takes my sample order and ships them to me, usually 2 each. MP
  7. MP1

    Led display Digital Voltmeter question

    Billy, I look forward to your findings when you are finished. I had planned to use this circuit as part of a larger project. Glad you found the bugs in it. I had also downloaded the data sheets, but I had not yet compared them with the project schematic. Good find! MP
  8. MP1

    Free sample chips!

    How this is possible: The IC companies want "you" the engineer to use their product in a design. If they give you a 25 cent part and you make a good design with it and it becomes a product, they will sell thousands of this part to the manufacturer of the product. This kind of makes you a part...
  9. MP1

    Convert 0-30V 3A PSU to 5A or more

    Yes, I was refering to the Transformer as T1. It is possible I have seen this schematic somewhere else with the listing as T1 or I possibly gave it an automatic designation as it would have to be T1. I have not built this power supply but from what I read in the text of how it works, I think it...
  10. MP1

    SK7804

    Looking for a data sheet and/or application notes for the SK7804. It would seem that I had one at some time. I have a few of these chips in my bin with no information. Appreciate any leads, as I have googled myself ragged :P Thanks. MP
  11. MP1

    Convert 0-30V 3A PSU to 5A or more

    As per the text on this circuit, I believe P2, Q3 and U3 are used for current limiting. P2 sets 1 volt at the input of the op amp to achieve this. The same circuitry that is turning on the current limit LED is limiting the current. Also, T1 will have to be rated at more than 3A. This might be...
  12. MP1

    Electronic Stethoscope

    Have you considered making the pulse tracer project and using this tool to inject a sound into the circuit? You could them probe it at the different stages and listen to see where you are losing the signal. These are just amplification stages with op amps, so the problem should surface quickly...
  13. MP1

    Data Sheet for LX1601A

    Perhaps the cross reference sheet that I have attached here will help. It gives quite a bit of information regarding the specs. MP br1477rev0.pdf
  14. MP1

    3-Axis Stepper Controller

    More than 20 pages of results with this google search for bipolar stepper driver --> http://www.google.com/search?q=bipolar+stepper+driver&hl=en&lr=&ie=UTF-8&oe=UTF-8&start=0&sa=N MP
  15. MP1

    Making PCBs with magazine's paper

    Rob, you want to figure wire thickness for the wattage needed. Then you convert the board copper to this dimension. I did have the information but I cannot find it. A google search for copper thickness and pcb might give you the result. Anyway, you have two choices for the thicker conductor...
  16. MP1

    varible voltage, current limiting, power supply

    The LM317 data sheet gives quite a bit of information regarding current control. I have attached a good copy of this information for those who are building the current regulating PSU with this regulator. MP LM317_Data_Sheet_REV_09142002.pdf
  17. MP1

    Send & Receive DTMF with MT8880

    It looks like you have posted this twice in this area. Are you requesting the data sheet for this device? If so, there is a different area where you might have more luck. I will remove the duplicate post. MP
  18. MP1

    Led display Digital Voltmeter question

    I have not yet tried this, but one should be able to have auto ranging with comparators and a 4066 cmos switch. MP
  19. MP1

    PCB Drill Hole Sizes

    You will probably find that the 0.8mm bit becomes your most used size. Are you using a small drill press or drilling by hand? The smaller drill bits tend to break very easy. You will find opinions differ in this subject, too. Rule of thumb is that you want to have the least number of different...
  20. MP1

    Making PCBs with magazine's paper

    Absolutely no offense taken here. I just felt the need to point out the reasons for the other methods. I am also glad that this method works well for you. There are lots of projects on the web which also provide a board layout. In the past, this has been a very expensive undertaking for the...
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